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/*******************************************************************************
 * Copyright (c) 2004, 2013 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.resource;

import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.graphics.Device;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Control;


/**
 * A local registry that shares its resources with some global registry.
 * LocalResourceManager is typically used to safeguard against leaks. Clients
 * can use a nested registry to allocate and deallocate resources in the
 * global registry. Calling dispose() on the nested registry will deallocate
 * everything allocated for the nested registry without affecting the rest
 * of the global registry.
 * 

* A nested registry can be used to manage the resources for, say, a dialog * box. *

* @since 3.1 */ public final class LocalResourceManager extends AbstractResourceManager { private ResourceManager parentRegistry; /** * Creates a local registry that delegates to the given global registry * for all resource allocation and deallocation. * * @param parentRegistry global registry */ public LocalResourceManager(ResourceManager parentRegistry) { this.parentRegistry = parentRegistry; } /** * Creates a local registry that wraps the given global registry. Anything * allocated by this registry will be automatically cleaned up with the given * control is disposed. Note that registries created in this way should not * be used to allocate any resource that must outlive the given control. * * @param parentRegistry global registry that handles resource allocation * @param owner control whose disposal will trigger cleanup of everything * in the registry. */ public LocalResourceManager(ResourceManager parentRegistry, Control owner) { this(parentRegistry); owner.addDisposeListener(new DisposeListener() { /* (non-Javadoc) * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent) */ @Override public void widgetDisposed(DisposeEvent e) { LocalResourceManager.this.dispose(); } }); } /* (non-Javadoc) * @see org.eclipse.jface.resource.ResourceManager#getDevice() */ @Override public Device getDevice() { return parentRegistry.getDevice(); } /* (non-Javadoc) * @see org.eclipse.jface.resource.AbstractResourceManager#allocate(org.eclipse.jface.resource.DeviceResourceDescriptor) */ @Override protected Object allocate(DeviceResourceDescriptor descriptor) throws DeviceResourceException { return parentRegistry.create(descriptor); } /* (non-Javadoc) * @see org.eclipse.jface.resource.AbstractResourceManager#deallocate(java.lang.Object, org.eclipse.jface.resource.DeviceResourceDescriptor) */ @Override protected void deallocate(Object resource, DeviceResourceDescriptor descriptor) { parentRegistry.destroy(descriptor); } /* (non-Javadoc) * @see org.eclipse.jface.resource.ResourceManager#getDefaultImage() */ @Override protected Image getDefaultImage() { return parentRegistry.getDefaultImage(); } }




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